well most every diesel engine i see other then power stroke and duramax are in lines. i dont think i have ever seen a big rig with a v motor. i know there out there but i would think cat and detroit are more popular with the inlines. i beleive that inlines make more torque because of the strait up and downward force of the piston. if you where to take a twenty pound weight hold it over your shoulder and do push it up and down its a little harder to push up but comes down hard as well. well take a 15 pound hold it at a 45 degree angle from your chin and move it away from you and towards you. its a little easier to push away and doesnt wanna come back as hard. you change your weights because in a 6 cyclinder i would think that the piston and connecting rod as well as the counter weights are heavier then on a v8. ..... torque is a twisting force so the harder that piston comes down the harder the crank is going to turn.
__________________
06 qc 4x4 g56 edge juice hot unlock smarty sbc dd 3600 strapped centerplate no more chatter! htt 62.65.12 2nd gen manifold leveled 35's 6"single 487hp 990tq